43688247271421 has 2 divisors, whose sum is σ = 43688247271422. Its totient is φ = 43688247271420.

The previous prime is 43688247271391. The next prime is 43688247271463. The reversal of 43688247271421 is 12417274288634.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30728607268921 + 12959640002500 = 5543339^2 + 3599950^2 .

It is a cyclic number.

It is not a de Polignac number, because 43688247271421 - 2²² = 43688243077117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43688247271021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21844123635710 + 21844123635711.

It is an arithmetic number, because the mean of its divisors is an integer number (21844123635711).

Almost surely, 2^{43688247271421} is an apocalyptic number.

It is an amenable number.

43688247271421 is a deficient number, since it is larger than the sum of its proper divisors (1).

43688247271421 is an equidigital number, since it uses as much as digits as its factorization.

43688247271421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28901376, while the sum is 59.

The spelling of 43688247271421 in words is "forty-three trillion, six hundred eighty-eight billion, two hundred forty-seven million, two hundred seventy-one thousand, four hundred twenty-one".